display: flow-root

- WD

The element generates a block container box, and lays out its contents using flow layout. It always establishes a new block formatting context for its contents. It provides a better solution to the most use cases of the "clearfix" hack.

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 96: Supported
  3. 97: Supported

Firefox

  1. 2 - 52: Not supported
  2. 53 - 95: Supported
  3. 96: Supported
  4. 97 - 98: Supported

Chrome

  1. 4 - 57: Not supported
  2. 58 - 96: Supported
  3. 97: Supported
  4. 98 - 100: Supported

Safari

  1. 3.1 - 12.1: Not supported
  2. 13 - 15.1: Supported
  3. 15.2: Supported
  4. TP: Supported

Opera

  1. 9 - 44: Not supported
  2. 45 - 81: Supported
  3. 82: Supported

Safari on iOS

  1. 3.2 - 12.5: Not supported
  2. 13 - 15.1: Supported
  3. 15.2: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 97: Supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 64: Supported

Chrome for Android

  1. 97: Supported

Firefox for Android

  1. 95: Supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 6.4: Not supported
  2. 7.2 - 14.0: Supported
  3. 15.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
Chromium bug report
WebKit bug report
Mozilla bug report
Blog post: "The end of the clearfix hack?"
Edge bug report